[Lens] Design for reorganized and renamed functions for Lens by default

[wylieconlon]

We have previously discussed reorganizing the list of functions in Lens, and it would be helpful to have a complete design that includes all of the features we are planning on adding. As of 7.9, the complete list of supported functions in Lens is:

Lens by default will include at least these additions:

• Positive rate([lens] Add "counter rate" for monotonically increasing numbers #46627)
• Cumulative sum ([Lens] Add cumulative sum aggregation #61776)
• Derivatives ([Lens] Add derivative function #61775)
• Moving average ([Lens] Add moving average aggregation #61777)
• Filter ratio (aka query/search ratio) ([Lens] Add simple ratio calculation, similar to filter ratio #42385)
• Filters aggregation ([Lens] Support filters aggregation #61330)
• Histogram aggregation ([Lens] Create combined histogram/range aggregation for numbers #59424)
• Range aggregation ([Lens] Create combined histogram/range aggregation for numbers #59424)

This issue should be updated as we have new thinking on how we want to present these options to users. The latest I'm aware of is shown here, but is probably out of date.

@cchaos can you update this as you think through these options?

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[flash1293]

Just for context: When working with xy-charts, only a subset of the operations is shown (because you can't use some for x axis and you can't use others for y axis). But in tables, the whole list is shown, so we should definitely consider how it looks.

[wylieconlon]

I think we can close this because the main problems have been resolved:

• The datatable no longer shows the full list, it splits it into "break down by" and "metrics" just like other charts
• The design for functions shows two columns instead of one, making it take less space